<!DOCTYPE html>












  


<html class="theme-next gemini use-motion" lang="zh-CN">
<head><meta name="generator" content="Hexo 3.9.0">
  <meta name="baidu-site-verification" content="sc1B5Cxcoz">
  <meta name="google-site-verification" content="OLcRj7lMnauxKrhFT3Q8Nvcexgv22NvlEmVZShKQKR8">
  <meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=2">
<meta name="theme-color" content="#222">


























  

<link rel="stylesheet" href="//cdn.bootcss.com/font-awesome/4.6.2/css/font-awesome.min.css">

<link rel="stylesheet" href="/css/main.css?v=7.0.1">


  <link rel="apple-touch-icon" sizes="180x180" href="/uploads/apple-touch.png?v=7.0.1">


  <link rel="icon" type="image/png" sizes="32x32" href="/uploads/favicon-32x32.png?v=7.0.1">


  <link rel="icon" type="image/png" sizes="16x16" href="/uploads/favicon-16x16.png?v=7.0.1">








<script id="hexo.configurations">
  var NexT = window.NexT || {};
  var CONFIG = {
    root: '/',
    scheme: 'Gemini',
    version: '7.0.1',
    sidebar: {"position":"right","display":"post","offset":12,"onmobile":false,"dimmer":false},
    back2top: true,
    back2top_sidebar: false,
    fancybox: false,
    fastclick: false,
    lazyload: true,
    tabs: true,
    motion: {"enable":true,"async":true,"transition":{"post_block":"fadeIn","post_header":"fadeIn","post_body":"fadeIn","coll_header":"fadeIn","sidebar":"fadeIn"}},
    algolia: {
      applicationID: '',
      apiKey: '',
      indexName: '',
      hits: {"per_page":10},
      labels: {"input_placeholder":"Search for Posts","hits_empty":"We didn't find any results for the search: ${query}","hits_stats":"${hits} results found in ${time} ms"}
    }
  };
</script>


  




  <meta name="description" content="在某些游戏研发or测试的需求中，需要在Unreal增加一个插件或者模块，里面启动一个服务器作为SDK，然后外部通过直连或者adb forward可以连接到客户端中，获取客户端实时的场景、actor信息等等。UE4本身除了socket server支持之外，也支持简单的HTTP Web Server。由于网上没有比较好的范例，因此这里给出一个例子。 本文以Unreal 4.24为例。搭建HTTP S">
<meta name="keywords" content="C++,HTTP Server,Web开发,UE4插件,UE4">
<meta property="og:type" content="article">
<meta property="og:title" content="【极客日常】在UE4插件中编写一个HTTP Web Server">
<meta property="og:url" content="http://utmhikari.github.io/2020/05/23/geekdaily/ue4_http_server/index.html">
<meta property="og:site_name" content="HiKariのTechLab">
<meta property="og:description" content="在某些游戏研发or测试的需求中，需要在Unreal增加一个插件或者模块，里面启动一个服务器作为SDK，然后外部通过直连或者adb forward可以连接到客户端中，获取客户端实时的场景、actor信息等等。UE4本身除了socket server支持之外，也支持简单的HTTP Web Server。由于网上没有比较好的范例，因此这里给出一个例子。 本文以Unreal 4.24为例。搭建HTTP S">
<meta property="og:locale" content="zh-CN">
<meta property="og:updated_time" content="2020-10-18T13:01:33.918Z">
<meta name="twitter:card" content="summary">
<meta name="twitter:title" content="【极客日常】在UE4插件中编写一个HTTP Web Server">
<meta name="twitter:description" content="在某些游戏研发or测试的需求中，需要在Unreal增加一个插件或者模块，里面启动一个服务器作为SDK，然后外部通过直连或者adb forward可以连接到客户端中，获取客户端实时的场景、actor信息等等。UE4本身除了socket server支持之外，也支持简单的HTTP Web Server。由于网上没有比较好的范例，因此这里给出一个例子。 本文以Unreal 4.24为例。搭建HTTP S">






  <link rel="canonical" href="http://utmhikari.github.io/2020/05/23/geekdaily/ue4_http_server/">



<script id="page.configurations">
  CONFIG.page = {
    sidebar: "",
  };
</script>

  <title>【极客日常】在UE4插件中编写一个HTTP Web Server | HiKariのTechLab</title>
  












  <noscript>
  <style>
  .use-motion .motion-element,
  .use-motion .brand,
  .use-motion .menu-item,
  .sidebar-inner,
  .use-motion .post-block,
  .use-motion .pagination,
  .use-motion .comments,
  .use-motion .post-header,
  .use-motion .post-body,
  .use-motion .collection-title { opacity: initial; }

  .use-motion .logo,
  .use-motion .site-title,
  .use-motion .site-subtitle {
    opacity: initial;
    top: initial;
  }

  .use-motion .logo-line-before i { left: initial; }
  .use-motion .logo-line-after i { right: initial; }
  </style>
</noscript>

</head>

<body itemscope itemtype="http://schema.org/WebPage" lang="zh-CN">

  
  
    
  

  <div class="container sidebar-position-right page-post-detail">
    <div class="headband"></div>

    <header id="header" class="header" itemscope itemtype="http://schema.org/WPHeader">
      <div class="header-inner"><div class="site-brand-wrapper">
  <div class="site-meta">
    

    <div class="custom-logo-site-title">
      <a href="/" class="brand" rel="start">
        <span class="logo-line-before"><i></i></span>
        <span class="site-title">HiKariのTechLab</span>
        <span class="logo-line-after"><i></i></span>
      </a>
    </div>
    
      
        <h1 class="site-subtitle" itemprop="description">光の技术屋</h1>
      
    
    
  </div>

  <div class="site-nav-toggle">
    <button aria-label="切换导航栏">
      <span class="btn-bar"></span>
      <span class="btn-bar"></span>
      <span class="btn-bar"></span>
    </button>
  </div>
</div>



<nav class="site-nav">
  
    <ul id="menu" class="menu">
      
        
        
        
          
          <li class="menu-item menu-item-home">

    
    
    
      
    

    

    <a href="/" rel="section"><i class="menu-item-icon fa fa-fw fa-home"></i> <br>首页</a>

  </li>
        
        
        
          
          <li class="menu-item menu-item-about">

    
    
    
      
    

    

    <a href="/about/" rel="section"><i class="menu-item-icon fa fa-fw fa-user"></i> <br>关于</a>

  </li>
        
        
        
          
          <li class="menu-item menu-item-tags">

    
    
    
      
    

    

    <a href="/tags/" rel="section"><i class="menu-item-icon fa fa-fw fa-tags"></i> <br>标签</a>

  </li>
        
        
        
          
          <li class="menu-item menu-item-categories">

    
    
    
      
    

    

    <a href="/categories/" rel="section"><i class="menu-item-icon fa fa-fw fa-th"></i> <br>分类</a>

  </li>
        
        
        
          
          <li class="menu-item menu-item-archives">

    
    
    
      
    

    

    <a href="/archives/" rel="section"><i class="menu-item-icon fa fa-fw fa-archive"></i> <br>归档</a>

  </li>
        
        
        
          
          <li class="menu-item menu-item-sitemap">

    
    
    
      
    

    

    <a href="/sitemap.xml" rel="section"><i class="menu-item-icon fa fa-fw fa-sitemap"></i> <br>站点地图</a>

  </li>

      
      
        <li class="menu-item menu-item-search">
          
            <a href="javascript:;" class="popup-trigger">
          
            
              <i class="menu-item-icon fa fa-search fa-fw"></i> <br>搜索</a>
        </li>
      
    </ul>
  

  

  
    <div class="site-search">
      
  <div class="popup search-popup local-search-popup">
  <div class="local-search-header clearfix">
    <span class="search-icon">
      <i class="fa fa-search"></i>
    </span>
    <span class="popup-btn-close">
      <i class="fa fa-times-circle"></i>
    </span>
    <div class="local-search-input-wrapper">
      <input autocomplete="off" placeholder="搜索..." spellcheck="false" type="text" id="local-search-input">
    </div>
  </div>
  <div id="local-search-result"></div>
</div>



    </div>
  
</nav>



  



</div>
    </header>

    
  
  
  
  

  

  <span class="exturl github-corner" data-url="aHR0cHM6Ly9naXRodWIuY29tL3V0bWhpa2FyaQ==" title="关注HiKariのGithub" aria-label="关注HiKariのGithub"><svg width="80" height="80" viewbox="0 0 250 250" style="fill: #222; color: #fff; position: absolute; top: 0; border: 0; right: 0;" aria-hidden="true"><path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"/><path d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2" fill="currentColor" style="transform-origin: 130px 106px;" class="octo-arm"/><path d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z" fill="currentColor" class="octo-body"/></svg></span>



    <main id="main" class="main">
      <div class="main-inner">
        <div class="content-wrap">
          
            

          
          <div id="content" class="content">
            

  <div id="posts" class="posts-expand">
    

  

  
  
  

  

  <article class="post post-type-normal" itemscope itemtype="http://schema.org/Article">
  
  
  
  <div class="post-block">
    <link itemprop="mainEntityOfPage" href="http://utmhikari.github.io/2020/05/23/geekdaily/ue4_http_server/">

    <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
      <meta itemprop="name" content="ひかり.HDQ">
      <meta itemprop="description" content="简约即走心">
      <meta itemprop="image" content="/uploads/avatar.png">
    </span>

    <span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
      <meta itemprop="name" content="HiKariのTechLab">
    </span>

    
      <header class="post-header">

        
        
          <h2 class="post-title" itemprop="name headline">【极客日常】在UE4插件中编写一个HTTP Web Server

              
            
          </h2>
        

        <div class="post-meta">
          <span class="post-time">

            
            
            

            
              <span class="post-meta-item-icon">
                <i class="fa fa-calendar-o"></i>
              </span>
              
                <span class="post-meta-item-text">发表于</span>
              

              
                
              

              <time title="创建时间：2020-05-23 13:33:33" itemprop="dateCreated datePublished" datetime="2020-05-23T13:33:33+08:00">2020-05-23</time>
            

            
              

              
                
                <span class="post-meta-divider">|</span>
                

                <span class="post-meta-item-icon">
                  <i class="fa fa-calendar-check-o"></i>
                </span>
                
                  <span class="post-meta-item-text">更新于</span>
                
                <time title="修改时间：2020-10-18 21:01:33" itemprop="dateModified" datetime="2020-10-18T21:01:33+08:00">2020-10-18</time>
              
            
          </span>

          
            <span class="post-category">
            
              <span class="post-meta-divider">|</span>
            
              <span class="post-meta-item-icon">
                <i class="fa fa-folder-o"></i>
              </span>
              
                <span class="post-meta-item-text">分类于</span>
              
              
                <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/极客日常/" itemprop="url" rel="index"><span itemprop="name">极客日常</span></a></span>

                
                
              
            </span>
          

          
            
            
          

          
          

          
            <span class="post-meta-divider">|</span>
            <span class="post-meta-item-icon">
            <i class="fa fa-eye"></i>
             阅读次数： 
            <span class="busuanzi-value" id="busuanzi_value_page_pv"></span>
            </span>
          

          

          

        </div>
      </header>
    

    
    
    
    <div class="post-body" itemprop="articleBody">

      
      

      
        <p>在某些游戏研发or测试的需求中，需要在Unreal增加一个插件或者模块，里面启动一个服务器作为SDK，然后外部通过直连或者adb forward可以连接到客户端中，获取客户端实时的场景、actor信息等等。UE4本身除了socket server支持之外，也支持简单的HTTP Web Server。由于网上没有比较好的范例，因此这里给出一个例子。</p>
<p>本文以Unreal 4.24为例。搭建HTTP Server，需要在<code>.Build.cs</code>中引入如下模块：</p>
<figure class="highlight csharp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line">PrivateDependencyModuleNames.AddRange(</span><br><span class="line">    <span class="keyword">new</span> <span class="keyword">string</span>[]</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="string">"CoreUObject"</span>,</span><br><span class="line">        <span class="string">"Engine"</span>,</span><br><span class="line">        <span class="string">"Slate"</span>,</span><br><span class="line">        <span class="string">"SlateCore"</span>,</span><br><span class="line">        <span class="comment">// ... add private dependencies that you statically link with here ...</span></span><br><span class="line">        <span class="string">"HTTP"</span>,</span><br><span class="line">        <span class="string">"HttpServer"</span>,</span><br><span class="line">        <span class="string">"JsonUtilities"</span>,</span><br><span class="line">        <span class="string">"Json"</span>,</span><br><span class="line">    &#125;</span><br><span class="line">    );</span><br></pre></td></tr></table></figure>
<p>通过<code>FHttpServerModule::Get()</code>方法，可以获得内置的HTTP Server模块的一个单例，该instance负责管理内置private的socket listeners。我们可以通过该单例获取<code>HTTPRouter</code>，然后绑定路由跟handler，然后调用<code>StartAllListeners</code>，就能够启动Web服务器。具体代码如下：</p>
<a id="more"></a>
<figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">"Runtime/Online/HTTPServer/Public/HttpServerModule.h"</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">"Runtime/Online/HTTPServer/Public/HttpPath.h"</span></span></span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">Start</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">    <span class="comment">// 如果插件module type为runtime之类，只要包括编辑器的，就加这个判断，这样编辑器里不会直接启动server，而standalone时候可以启动</span></span><br><span class="line">    <span class="comment">// 如果编辑器里直接启动了，那么改代码重新编译会卡住</span></span><br><span class="line">    <span class="keyword">if</span> (!GIsEditor)</span><br><span class="line">    &#123;</span><br><span class="line">        StartServer(Port);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">StartServer</span><span class="params">(uint32 Port)</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">    <span class="keyword">auto</span> HttpServerModule = &amp;FHttpServerModule::Get();</span><br><span class="line">    TSharedPtr&lt;IHttpRouter&gt; HttpRouter = HttpServerModule-&gt;GetHttpRouter(Port);</span><br><span class="line">    <span class="comment">// 这里注意一个点，就是底层不支持相同http path配置不同的request method</span></span><br><span class="line">    HttpRouter-&gt;BindRoute(FHttpPath(TEXT(<span class="string">"/health"</span>)), EHttpServerRequestVerbs::VERB_GET, HEALTH_CHECK_HANDLER);</span><br><span class="line">    HttpServerModule-&gt;StartAllListeners();</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>其中，HEALTH_CHECK_HANDLER需要传进来一个TFunction，可以通过相关代码查阅到。</p>
<figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// Runtime\Online\HTTPServer\Private\HttpRouter.cpp</span></span><br><span class="line"></span><br><span class="line">FHttpRouteHandle FHttpRouter::BindRoute(<span class="keyword">const</span> FHttpPath&amp; HttpPath,  <span class="keyword">const</span> EHttpServerRequestVerbs&amp; HttpVerbs,  <span class="keyword">const</span> FHttpRequestHandler&amp; Handler)</span><br><span class="line">&#123;</span><br><span class="line">    check(HttpPath.IsValidPath());</span><br><span class="line">    check(EHttpServerRequestVerbs::VERB_NONE != HttpVerbs);</span><br><span class="line"></span><br><span class="line">    <span class="keyword">if</span> (RequestHandlerRegistrar-&gt;Contains(HttpPath.GetPath()))</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="literal">nullptr</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">auto</span> RouteHandle = MakeShared&lt;FHttpRouteHandleInternal&gt;(HttpPath.GetPath(), HttpVerbs, Handler);</span><br><span class="line">    RequestHandlerRegistrar-&gt;Add(HttpPath.GetPath(), RouteHandle);</span><br><span class="line"></span><br><span class="line">    <span class="keyword">return</span> RouteHandle;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">// Runtime\Online\HTTPServer\Public\HttpRequestHandler.h</span></span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * FHttpRequestHandler</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> *  NOTE - Returning true implies that the delegate will eventually invoke OnComplete</span></span><br><span class="line"><span class="comment"> *  NOTE - Returning false implies that the delegate will never invoke OnComplete</span></span><br><span class="line"><span class="comment"> * </span></span><br><span class="line"><span class="comment"> * @param Request The incoming http request to be handled</span></span><br><span class="line"><span class="comment"> * @param OnComplete The callback to invoke to write an http response</span></span><br><span class="line"><span class="comment"> * @return True if the request has been handled, false otherwise</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">typedef</span> TFunction&lt;<span class="keyword">bool</span>(<span class="keyword">const</span> FHttpServerRequest&amp; Request, <span class="keyword">const</span> FHttpResultCallback&amp; OnComplete)&gt; FHttpRequestHandler;</span><br><span class="line"></span><br><span class="line"><span class="comment">// Runtime\Online\HTTPServer\Public\HttpResultCallback.h</span></span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment">* FHttpResultCallback</span></span><br><span class="line"><span class="comment">* This callback is intended to be invoked exclusively by FHttpRequestHandler delegates</span></span><br><span class="line"><span class="comment">* </span></span><br><span class="line"><span class="comment">* @param Response The response to write</span></span><br><span class="line"><span class="comment">*/</span></span><br><span class="line"><span class="keyword">typedef</span> TFunction&lt;<span class="keyword">void</span>(TUniquePtr&lt;FHttpServerResponse&gt;&amp;&amp; Response)&gt; FHttpResultCallback;</span><br></pre></td></tr></table></figure>
<p>在FHttpRequestHandler函数内部中，如果调用了<code>OnComplete(Response)</code>但<code>return false</code>的话，会<code>CHECK</code>不过造成程序crash。因此，可以封装一个生成<code>FHttpRequestHandler</code>的函数，使得实际只需要根据Request返回一个Response就可以。我们把这种函数自定义为<code>FHttpResponser</code>：</p>
<figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">typedef</span> TFunction&lt;TUniquePtr&lt;FHttpServerResponse&gt;(<span class="keyword">const</span> FHttpServerRequest&amp; Request)&gt; FHttpResponser;</span><br><span class="line"></span><br><span class="line"><span class="function">FHttpRequestHandler <span class="title">CreateHandler</span><span class="params">(<span class="keyword">const</span> FHttpResponser&amp; HttpResponser)</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">    <span class="keyword">return</span> [HttpResponser](<span class="keyword">const</span> FHttpServerRequest&amp; Request, <span class="keyword">const</span> FHttpResultCallback&amp; OnComplete)</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="keyword">auto</span> Response = HttpResponser(Request);</span><br><span class="line">        <span class="keyword">if</span> (Response == <span class="literal">nullptr</span>)</span><br><span class="line">        &#123;</span><br><span class="line">            <span class="keyword">return</span> <span class="literal">false</span>;</span><br><span class="line">        &#125;</span><br><span class="line">        OnComplete(MoveTemp(Response));</span><br><span class="line">        <span class="keyword">return</span> <span class="literal">true</span>;</span><br><span class="line">    &#125;;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>然后我们实际只需要编写<code>FHttpResponser</code>就可以了。比如上面的HEALTH_CHECK_HANDLER例子如下：</p>
<figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br></pre></td><td class="code"><pre><span class="line">TUniquePtr&lt;FHttpServerResponse&gt; HealthCheck(<span class="keyword">const</span> FHttpServerRequest&amp; Request)</span><br><span class="line">&#123;</span><br><span class="line">    UE_LOG(UALog, Log, TEXT(<span class="string">"Health Check"</span>));</span><br><span class="line">    <span class="keyword">if</span> (GEngine != <span class="literal">nullptr</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        GEngine-&gt;AddOnScreenDebugMessage(<span class="number">-1</span>, <span class="number">10.0f</span>, FColor::Green, TEXT(<span class="string">"Health Check Successfully!"</span>));</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">return</span> SuccessResponse(<span class="string">"Health Check Successfully!"</span>);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">// HttpRouter-&gt;BindRoute(</span></span><br><span class="line"><span class="comment">//     FHttpPath(TEXT("/health")),</span></span><br><span class="line"><span class="comment">//     EHttpServerRequestVerbs::VERB_GET,</span></span><br><span class="line"><span class="comment">//     CreateHandler(&amp;FBaseHandler::HealthCheck));</span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">TUniquePtr&lt;FHttpServerResponse&gt; SuccessResponse(TSharedPtr&lt;FJsonObject&gt; Data, FString Message)</span><br><span class="line">&#123;</span><br><span class="line">    <span class="keyword">return</span> JsonResponse(Data, Message, <span class="literal">true</span>, SUCCESS_CODE);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">TUniquePtr&lt;FHttpServerResponse&gt; JsonResponse(TSharedPtr&lt;FJsonObject&gt; Data, FString Message, <span class="keyword">bool</span> Success, int32 Code)</span><br><span class="line">&#123;</span><br><span class="line">    TSharedPtr&lt;FJsonObject&gt; JsonObject = MakeShareable(<span class="keyword">new</span> FJsonObject());</span><br><span class="line">    JsonObject-&gt;SetObjectField(TEXT(<span class="string">"data"</span>), Data);</span><br><span class="line">    JsonObject-&gt;SetStringField(TEXT(<span class="string">"message"</span>), Message);</span><br><span class="line">    JsonObject-&gt;SetBoolField(TEXT(<span class="string">"success"</span>), Success);</span><br><span class="line">    JsonObject-&gt;SetNumberField(TEXT(<span class="string">"code"</span>), (<span class="keyword">double</span>)Code);</span><br><span class="line">    FString JsonString;</span><br><span class="line">    TSharedRef&lt;TJsonWriter&lt;&gt;&gt; Writer = TJsonWriterFactory&lt;&gt;::Create(&amp;JsonString);</span><br><span class="line">    FJsonSerializer::Serialize(JsonObject.ToSharedRef(), Writer);</span><br><span class="line">    <span class="keyword">return</span> FHttpServerResponse::Create(JsonString, TEXT(<span class="string">"application/json"</span>));</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>由于一般HTTP返回的body是json，因此可以像上述一样另外封装作为模板response body的函数。对于request body，要转换为json，可以另外加函数去获取<code>TSharedPtr&lt;FJsonObject&gt;</code>的request json body实例。首先检查header是否为json格式，然后转化为json。采用<code>UTF8_TO_TCHAR</code>方法可以支持转换中文。</p>
<figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br></pre></td><td class="code"><pre><span class="line">TSharedPtr&lt;FJsonObject&gt; GetRequestJsonBody(<span class="keyword">const</span> FHttpServerRequest&amp; Request)</span><br><span class="line">&#123;</span><br><span class="line">    <span class="comment">// check if content type is application/json</span></span><br><span class="line">    <span class="keyword">bool</span> IsUTF8JsonContent = IsUTF8JsonRequestContent(Request);</span><br><span class="line">    <span class="keyword">if</span> (!IsUTF8JsonContent)</span><br><span class="line">    &#123;</span><br><span class="line">        UE_LOG(UALog, Warning, TEXT(<span class="string">"caught request not in utf-8 application/json body content!"</span>));</span><br><span class="line">        <span class="keyword">return</span> <span class="literal">nullptr</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">// body to utf8 string</span></span><br><span class="line">    TArray&lt;uint8&gt; RequestBodyBytes = Request.Body;</span><br><span class="line">    FString RequestBodyString = FString(UTF8_TO_TCHAR(RequestBodyBytes.GetData()));</span><br><span class="line"></span><br><span class="line">    <span class="comment">// string to json</span></span><br><span class="line">    TSharedRef&lt;TJsonReader&lt;&gt;&gt; JsonReader = TJsonReaderFactory&lt;&gt;::Create(RequestBodyString);</span><br><span class="line">    TSharedPtr&lt;FJsonObject&gt; RequestBody;</span><br><span class="line">    <span class="keyword">if</span> (!FJsonSerializer::Deserialize(JsonReader, RequestBody))</span><br><span class="line">    &#123;</span><br><span class="line">        UE_LOG(UALog, Warning, TEXT(<span class="string">"failed to parse request string to json: %s"</span>), *RequestBodyString);</span><br><span class="line">        <span class="keyword">return</span> <span class="literal">nullptr</span>;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">return</span> RequestBody;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">bool</span> <span class="title">IsUTF8JsonRequestContent</span><span class="params">(<span class="keyword">const</span> FHttpServerRequest&amp; Request)</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">    <span class="keyword">bool</span> bIsUTF8JsonContent = <span class="literal">false</span>;</span><br><span class="line">    <span class="keyword">for</span> (<span class="keyword">auto</span>&amp; HeaderElem : Request.Headers)</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="keyword">if</span> (HeaderElem.Key == TEXT(<span class="string">"Content-type"</span>))</span><br><span class="line">        &#123;</span><br><span class="line">            <span class="keyword">for</span> (<span class="keyword">auto</span>&amp; Value : HeaderElem.Value)</span><br><span class="line">            &#123;</span><br><span class="line">                <span class="keyword">auto</span> LowerValue = Value.ToLower();</span><br><span class="line">                <span class="keyword">if</span> (LowerValue.StartsWith(TEXT(<span class="string">"charset="</span>)) &amp;&amp; LowerValue != TEXT(<span class="string">"charset=utf-8"</span>))</span><br><span class="line">                &#123;</span><br><span class="line">                    <span class="keyword">return</span> <span class="literal">false</span>;</span><br><span class="line">                &#125;</span><br><span class="line">                <span class="keyword">if</span> (LowerValue == TEXT(<span class="string">"application/json"</span>) || LowerValue == TEXT(<span class="string">"text/json"</span>))</span><br><span class="line">                &#123;</span><br><span class="line">                    bIsUTF8JsonContent = <span class="literal">true</span>;</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">return</span> bIsUTF8JsonContent;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>这样，UE4的一个基本的C++ HTTP Web Server就成型了。笔者因之做了一个简单的模板，传送门在<span class="exturl" data-url="aHR0cHM6Ly9naXRodWIuY29tL3V0bWhpa2FyaS9VbnJlYWxIdHRwU2VydmVy" title="https://github.com/utmhikari/UnrealHttpServer">UnrealHttpAutomator<i class="fa fa-external-link"></i></span>~</p>

      
    </div>

    

    
    
    

    
      
<div style="border: 1px solid black; margin-top: 32px; margin-bottom: 32px">
  <div style="margin-left:10px">
    <span style="font-weight:bold">版权声明</span>
    <br>
    <span>本文为博客<a href="https://utmhikari.github.io" style="color:#258FC6">HiKariのTechLab</a>原创文章，转载请标明出处，谢谢~~~</span>
  </div>
</div>


    

    

    
      
    
    

    

    <footer class="post-footer">
      
        <div class="post-tags">
          
            <a href="/tags/C/" rel="tag"># C++</a>
          
            <a href="/tags/HTTP-Server/" rel="tag"># HTTP Server</a>
          
            <a href="/tags/Web开发/" rel="tag"># Web开发</a>
          
            <a href="/tags/UE4插件/" rel="tag"># UE4插件</a>
          
            <a href="/tags/UE4/" rel="tag"># UE4</a>
          
        </div>
      

      
      
      

      
        <div class="post-nav">
          <div class="post-nav-next post-nav-item">
            
              <a href="/2020/05/05/testlife/try_gautomator/" rel="next" title="【测试人生】游戏自动化测试工具GAutomator上手">
                <i class="fa fa-chevron-left"></i> 【测试人生】游戏自动化测试工具GAutomator上手
              </a>
            
          </div>

          <span class="post-nav-divider"></span>

          <div class="post-nav-prev post-nav-item">
            
              <a href="/2020/06/13/testlife/coverage_beautify/" rel="prev" title="【测试人生】代码覆盖率测试之代码染色优化——以lua代码覆盖为例">
                【测试人生】代码覆盖率测试之代码染色优化——以lua代码覆盖为例 <i class="fa fa-chevron-right"></i>
              </a>
            
          </div>
        </div>
      

      
      
    </footer>
  </div>
  
  
  
  </article>


  </div>


          </div>
          

  



        </div>
        
          
  
  <div class="sidebar-toggle">
    <div class="sidebar-toggle-line-wrap">
      <span class="sidebar-toggle-line sidebar-toggle-line-first"></span>
      <span class="sidebar-toggle-line sidebar-toggle-line-middle"></span>
      <span class="sidebar-toggle-line sidebar-toggle-line-last"></span>
    </div>
  </div>

  <aside id="sidebar" class="sidebar">
    <div class="sidebar-inner">

      

      

      <div class="site-overview-wrap sidebar-panel sidebar-panel-active">
        <div class="site-overview">
          <div class="site-author motion-element" itemprop="author" itemscope itemtype="http://schema.org/Person">
            
              <img class="site-author-image" itemprop="image" src="/uploads/avatar.png" alt="ひかり.HDQ">
            
              <p class="site-author-name" itemprop="name">ひかり.HDQ</p>
              <div class="site-description motion-element" itemprop="description">简约即走心</div>
          </div>

          
            <nav class="site-state motion-element">
              
                <div class="site-state-item site-state-posts">
                
                  <a href="/archives/">
                
                    <span class="site-state-item-count">60</span>
                    <span class="site-state-item-name">日志</span>
                  </a>
                </div>
              

              
                
                
                <div class="site-state-item site-state-categories">
                  
                    
                      <a href="/categories/">
                    
                  
                    
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                    <span class="site-state-item-count">7</span>
                    <span class="site-state-item-name">分类</span>
                  </a>
                </div>
              

              
                
                
                <div class="site-state-item site-state-tags">
                  
                    
                      <a href="/tags/">
                    
                  
                    
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                      
                    
                    <span class="site-state-item-count">201</span>
                    <span class="site-state-item-name">标签</span>
                  </a>
                </div>
              
            </nav>
          

          

          

          
            <div class="links-of-author motion-element">
              
                <span class="links-of-author-item">
                  
                  
                    
                  
                  
                    
                  
                  <span class="exturl" data-url="aHR0cHM6Ly9naXRodWIuY29tL3V0bWhpa2FyaQ==" title="GitHub &rarr; https://github.com/utmhikari"><i class="fa fa-fw fa-github"></i>GitHub</span>
                </span>
              
                <span class="links-of-author-item">
                  
                  
                    
                  
                  
                    
                  
                  <span class="exturl" data-url="bWFpbHRvOmhkcTk0MDYyM0AxMjYuY29t" title="Mail &rarr; mailto:hdq940623@126.com"><i class="fa fa-fw fa-envelope"></i>Mail</span>
                </span>
              
                <span class="links-of-author-item">
                  
                  
                    
                  
                  
                    
                  
                  <span class="exturl" data-url="aHR0cHM6Ly90ZXN0ZXJob21lLmNvbS91dG1oaWthcmk=" title="TesterHome &rarr; https://testerhome.com/utmhikari"><i class="fa fa-fw fa-tumblr"></i>TesterHome</span>
                </span>
              
                <span class="links-of-author-item">
                  
                  
                    
                  
                  
                    
                  
                  <span class="exturl" data-url="aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTM4NDI1MDE=" title="CSDN &rarr; https://blog.csdn.net/u013842501"><i class="fa fa-fw fa-copyright"></i>CSDN</span>
                </span>
              
                <span class="links-of-author-item">
                  
                  
                    
                  
                  
                    
                  
                  <span class="exturl" data-url="aHR0cHM6Ly9zdGVhbWNvbW11bml0eS5jb20vaWQvdXRtaGlrYXJp" title="Steam &rarr; https://steamcommunity.com/id/utmhikari"><i class="fa fa-fw fa-steam"></i>Steam</span>
                </span>
              
                <span class="links-of-author-item">
                  
                  
                    
                  
                  
                    
                  
                  <span class="exturl" data-url="aHR0cHM6Ly9zcGFjZS5iaWxpYmlsaS5jb20vMTUwNzUxMTQv" title="Bilibili &rarr; https://space.bilibili.com/15075114/"><i class="fa fa-fw fa-bold"></i>Bilibili</span>
                </span>
              
            </div>
          

          

          
          

          
            
          
          

        </div>
      </div>

      

      

    </div>
  </aside>
  


        
      </div>
    </main>

    <footer id="footer" class="footer">
      <div class="footer-inner">
        <div class="copyright">&copy; 2019 – <span itemprop="copyrightYear">2020</span>
  <span class="with-love" id="animate">
    <i class="fa fa-user"></i>
  </span>
  <span class="author" itemprop="copyrightHolder">ひかり.HDQ</span>

  

  
</div>









        
<div class="busuanzi-count">
  <script async src="https://busuanzi.ibruce.info/busuanzi/2.3/busuanzi.pure.mini.js"></script>

  
    <span class="post-meta-item-icon">
      <i class="fa fa-user"></i>
    </span>
    <span class="site-uv" title="总访客量">
      <span class="busuanzi-value" id="busuanzi_value_site_uv"></span>
    </span>
  

  
    <span class="post-meta-divider">|</span>
  

  
    <span class="post-meta-item-icon">
      <i class="fa fa-eye"></i>
    </span>
    <span class="site-pv" title="总访问量">
      <span class="busuanzi-value" id="busuanzi_value_site_pv"></span>
    </span>
  
</div>









        
      </div>
    </footer>

    
      <div class="back-to-top">
        <i class="fa fa-arrow-up"></i>
        
      </div>
    

    

    

    
  </div>

  

<script>
  if (Object.prototype.toString.call(window.Promise) !== '[object Function]') {
    window.Promise = null;
  }
</script>







  




















  
  <script src="//cdn.bootcss.com/jquery/2.1.3/jquery.min.js"></script>

  
  <script src="//cdn.bootcss.com/jquery_lazyload/1.9.7/jquery.lazyload.min.js"></script>

  
  <script src="//cdn.bootcss.com/velocity/1.2.1/velocity.min.js"></script>

  
  <script src="//cdn.bootcss.com/velocity/1.2.1/velocity.ui.min.js"></script>


  


  <script src="/js/src/utils.js?v=7.0.1"></script>

  <script src="/js/src/motion.js?v=7.0.1"></script>



  
  


  <script src="/js/src/affix.js?v=7.0.1"></script>

  <script src="/js/src/schemes/pisces.js?v=7.0.1"></script>




  
  <script src="/js/src/scrollspy.js?v=7.0.1"></script>
<script src="/js/src/post-details.js?v=7.0.1"></script>



  


  <script src="/js/src/next-boot.js?v=7.0.1"></script>


  

  
  <script src="/js/src/exturl.js?v=7.0.1"></script>


  

  


  


  
  <script>
    // Popup Window;
    var isfetched = false;
    var isXml = true;
    // Search DB path;
    var search_path = "search.xml";
    if (search_path.length === 0) {
      search_path = "search.xml";
    } else if (/json$/i.test(search_path)) {
      isXml = false;
    }
    var path = "/" + search_path;
    // monitor main search box;

    var onPopupClose = function (e) {
      $('.popup').hide();
      $('#local-search-input').val('');
      $('.search-result-list').remove();
      $('#no-result').remove();
      $(".local-search-pop-overlay").remove();
      $('body').css('overflow', '');
    }

    function proceedsearch() {
      $("body")
        .append('<div class="search-popup-overlay local-search-pop-overlay"></div>')
        .css('overflow', 'hidden');
      $('.search-popup-overlay').click(onPopupClose);
      $('.popup').toggle();
      var $localSearchInput = $('#local-search-input');
      $localSearchInput.attr("autocapitalize", "none");
      $localSearchInput.attr("autocorrect", "off");
      $localSearchInput.focus();
    }

    // search function;
    var searchFunc = function(path, search_id, content_id) {
      'use strict';

      // start loading animation
      $("body")
        .append('<div class="search-popup-overlay local-search-pop-overlay">' +
          '<div id="search-loading-icon">' +
          '<i class="fa fa-spinner fa-pulse fa-5x fa-fw"></i>' +
          '</div>' +
          '</div>')
        .css('overflow', 'hidden');
      $("#search-loading-icon").css('margin', '20% auto 0 auto').css('text-align', 'center');

      

      $.ajax({
        url: path,
        dataType: isXml ? "xml" : "json",
        async: true,
        success: function(res) {
          // get the contents from search data
          isfetched = true;
          $('.popup').detach().appendTo('.header-inner');
          var datas = isXml ? $("entry", res).map(function() {
            return {
              title: $("title", this).text(),
              content: $("content",this).text(),
              url: $("url" , this).text()
            };
          }).get() : res;
          var input = document.getElementById(search_id);
          var resultContent = document.getElementById(content_id);
          var inputEventFunction = function() {
            var searchText = input.value.trim().toLowerCase();
            var keywords = searchText.split(/[\s\-]+/);
            if (keywords.length > 1) {
              keywords.push(searchText);
            }
            var resultItems = [];
            if (searchText.length > 0) {
              // perform local searching
              datas.forEach(function(data) {
                var isMatch = false;
                var hitCount = 0;
                var searchTextCount = 0;
                var title = data.title.trim();
                var titleInLowerCase = title.toLowerCase();
                var content = data.content.trim().replace(/<[^>]+>/g,"");
                
                var contentInLowerCase = content.toLowerCase();
                var articleUrl = decodeURIComponent(data.url).replace(/\/{2,}/g, '/');
                var indexOfTitle = [];
                var indexOfContent = [];
                // only match articles with not empty titles
                if(title != '') {
                  keywords.forEach(function(keyword) {
                    function getIndexByWord(word, text, caseSensitive) {
                      var wordLen = word.length;
                      if (wordLen === 0) {
                        return [];
                      }
                      var startPosition = 0, position = [], index = [];
                      if (!caseSensitive) {
                        text = text.toLowerCase();
                        word = word.toLowerCase();
                      }
                      while ((position = text.indexOf(word, startPosition)) > -1) {
                        index.push({position: position, word: word});
                        startPosition = position + wordLen;
                      }
                      return index;
                    }

                    indexOfTitle = indexOfTitle.concat(getIndexByWord(keyword, titleInLowerCase, false));
                    indexOfContent = indexOfContent.concat(getIndexByWord(keyword, contentInLowerCase, false));
                  });
                  if (indexOfTitle.length > 0 || indexOfContent.length > 0) {
                    isMatch = true;
                    hitCount = indexOfTitle.length + indexOfContent.length;
                  }
                }

                // show search results

                if (isMatch) {
                  // sort index by position of keyword

                  [indexOfTitle, indexOfContent].forEach(function (index) {
                    index.sort(function (itemLeft, itemRight) {
                      if (itemRight.position !== itemLeft.position) {
                        return itemRight.position - itemLeft.position;
                      } else {
                        return itemLeft.word.length - itemRight.word.length;
                      }
                    });
                  });

                  // merge hits into slices

                  function mergeIntoSlice(text, start, end, index) {
                    var item = index[index.length - 1];
                    var position = item.position;
                    var word = item.word;
                    var hits = [];
                    var searchTextCountInSlice = 0;
                    while (position + word.length <= end && index.length != 0) {
                      if (word === searchText) {
                        searchTextCountInSlice++;
                      }
                      hits.push({position: position, length: word.length});
                      var wordEnd = position + word.length;

                      // move to next position of hit

                      index.pop();
                      while (index.length != 0) {
                        item = index[index.length - 1];
                        position = item.position;
                        word = item.word;
                        if (wordEnd > position) {
                          index.pop();
                        } else {
                          break;
                        }
                      }
                    }
                    searchTextCount += searchTextCountInSlice;
                    return {
                      hits: hits,
                      start: start,
                      end: end,
                      searchTextCount: searchTextCountInSlice
                    };
                  }

                  var slicesOfTitle = [];
                  if (indexOfTitle.length != 0) {
                    slicesOfTitle.push(mergeIntoSlice(title, 0, title.length, indexOfTitle));
                  }

                  var slicesOfContent = [];
                  while (indexOfContent.length != 0) {
                    var item = indexOfContent[indexOfContent.length - 1];
                    var position = item.position;
                    var word = item.word;
                    // cut out 100 characters
                    var start = position - 20;
                    var end = position + 80;
                    if(start < 0){
                      start = 0;
                    }
                    if (end < position + word.length) {
                      end = position + word.length;
                    }
                    if(end > content.length){
                      end = content.length;
                    }
                    slicesOfContent.push(mergeIntoSlice(content, start, end, indexOfContent));
                  }

                  // sort slices in content by search text's count and hits' count

                  slicesOfContent.sort(function (sliceLeft, sliceRight) {
                    if (sliceLeft.searchTextCount !== sliceRight.searchTextCount) {
                      return sliceRight.searchTextCount - sliceLeft.searchTextCount;
                    } else if (sliceLeft.hits.length !== sliceRight.hits.length) {
                      return sliceRight.hits.length - sliceLeft.hits.length;
                    } else {
                      return sliceLeft.start - sliceRight.start;
                    }
                  });

                  // select top N slices in content

                  var upperBound = parseInt('5');
                  if (upperBound >= 0) {
                    slicesOfContent = slicesOfContent.slice(0, upperBound);
                  }

                  // highlight title and content

                  function highlightKeyword(text, slice) {
                    var result = '';
                    var prevEnd = slice.start;
                    slice.hits.forEach(function (hit) {
                      result += text.substring(prevEnd, hit.position);
                      var end = hit.position + hit.length;
                      result += '<b class="search-keyword">' + text.substring(hit.position, end) + '</b>';
                      prevEnd = end;
                    });
                    result += text.substring(prevEnd, slice.end);
                    return result;
                  }

                  var resultItem = '';

                  if (slicesOfTitle.length != 0) {
                    resultItem += "<li><a href='" + articleUrl + "' class='search-result-title'>" + highlightKeyword(title, slicesOfTitle[0]) + "</a>";
                  } else {
                    resultItem += "<li><a href='" + articleUrl + "' class='search-result-title'>" + title + "</a>";
                  }

                  slicesOfContent.forEach(function (slice) {
                    resultItem += "<a href='" + articleUrl + "'>" +
                      "<p class=\"search-result\">" + highlightKeyword(content, slice) +
                      "...</p>" + "</a>";
                  });

                  resultItem += "</li>";
                  resultItems.push({
                    item: resultItem,
                    searchTextCount: searchTextCount,
                    hitCount: hitCount,
                    id: resultItems.length
                  });
                }
              })
            };
            if (keywords.length === 1 && keywords[0] === "") {
              resultContent.innerHTML = '<div id="no-result"><i class="fa fa-search fa-5x"></i></div>'
            } else if (resultItems.length === 0) {
              resultContent.innerHTML = '<div id="no-result"><i class="fa fa-frown-o fa-5x"></i></div>'
            } else {
              resultItems.sort(function (resultLeft, resultRight) {
                if (resultLeft.searchTextCount !== resultRight.searchTextCount) {
                  return resultRight.searchTextCount - resultLeft.searchTextCount;
                } else if (resultLeft.hitCount !== resultRight.hitCount) {
                  return resultRight.hitCount - resultLeft.hitCount;
                } else {
                  return resultRight.id - resultLeft.id;
                }
              });
              var searchResultList = '<ul class=\"search-result-list\">';
              resultItems.forEach(function (result) {
                searchResultList += result.item;
              })
              searchResultList += "</ul>";
              resultContent.innerHTML = searchResultList;
            }
          }

          if ('auto' === 'manual') {
            input.addEventListener('input', inputEventFunction);
          } else {
            $('.search-icon').click(inputEventFunction);
            input.addEventListener('keypress', function (event) {
              if (event.keyCode === 13) {
                inputEventFunction();
              }
            });
          }

          // remove loading animation
          $(".local-search-pop-overlay").remove();
          $('body').css('overflow', '');

          proceedsearch();
        }
      });
    }

    // handle and trigger popup window;
    $('.popup-trigger').click(function(e) {
      e.stopPropagation();
      if (isfetched === false) {
        searchFunc(path, 'local-search-input', 'local-search-result');
      } else {
        proceedsearch();
      };
    });

    $('.popup-btn-close').click(onPopupClose);
    $('.popup').click(function(e){
      e.stopPropagation();
    });
    $(document).on('keyup', function (event) {
      var shouldDismissSearchPopup = event.which === 27 &&
        $('.search-popup').is(':visible');
      if (shouldDismissSearchPopup) {
        onPopupClose();
      }
    });
  </script>





  

  

  

  

  
<script>
if ($('body').find('pre.mermaid').length) {
  $.ajax({
    type: 'GET',
    url: '//cdn.bootcss.com/mermaid/8.0.0-rc.8/mermaid.min.js',
    dataType: 'script',
    cache: true,
    success: function() {
      mermaid.initialize({
        theme: 'dark',
        logLevel: 3,
        flowchart: { curve: 'linear' },
        gantt: { axisFormat: '%m/%d/%Y' },
        sequence: { actorMargin: 50 }
      });
    }
  });
}
</script>


  
  <script>
    (function(){
        var bp = document.createElement('script');
        var curProtocol = window.location.protocol.split(':')[0];
        if (curProtocol === 'https') {
            bp.src = 'https://zz.bdstatic.com/linksubmit/push.js';
        }
        else {
            bp.src = 'http://push.zhanzhang.baidu.com/push.js';
        }
        var s = document.getElementsByTagName("script")[0];
        s.parentNode.insertBefore(bp, s);
    })();
  </script>


  

  

  

  

  

  
<script>
  $('.highlight').each(function(i, e) {
    var $wrap = $('<div>').addClass('highlight-wrap');
    $(e).after($wrap);
    $wrap.append($('<button>').addClass('copy-btn').append('复制').on('click', function(e) {
      var code = $(this).parent().find('.code').find('.line').map(function(i, e) {
        return $(e).text();
      }).toArray().join('\n');
      var ta = document.createElement('textarea');
      var yPosition = window.pageYOffset || document.documentElement.scrollTop;
      ta.style.top = yPosition + 'px'; // Prevent page scroll
      ta.style.position = 'absolute';
      ta.style.opacity = '0';
      ta.readOnly = true;
      ta.value = code;
      document.body.appendChild(ta);
      ta.select();
      ta.setSelectionRange(0, code.length);
      ta.readOnly = false;
      var result = document.execCommand('copy');
      
        if (result) $(this).text('复制成功');
        else $(this).text('复制失败');
      
      ta.blur(); // For iOS
      $(this).blur();
    })).on('mouseleave', function(e) {
      var $b = $(this).find('.copy-btn');
      setTimeout(function() {
        $b.text('复制');
      }, 300);
    }).append(e);
  })
</script>


  

  

</body>
</html>
